Printing skills talk: 20/80 principle in the printing workshop
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“80% of the revenue comes from 20% of customers.” This is the Pareto law that everyone is very familiar with, also known as.
The 20/80 rule "majority, they can only cause a small impact. A few, they cause major, significant shadows.
"Pareto's law is usually used to explain the distribution of wealth in society. Here we analyze the printing workshop.
The relationship between the quality problem and this famous theorem.
First find out the defective products and waste products and the causes, and after analyzing enough, it will cause quality problems.
The reasons are sorted according to their importance, and the most important factors are ranked first. You may find that
The top 20% cause 80% quality problems. As shown in Table 1 and Table 2.
Table 1: Analysis of the quality of the printing shop with Pareto's law
Quality defects Printing machine 1 Printing machine 2 Printing machine 3 Printing machine 4 Total defective quantity
Color cast 550 430 234 476 1690
Imprinting is not allowed 150 27 31 265 473
White spot 50 45 80 10 185
Printed scratches 10 14 3 60 87
Too much dusting 16 21 30 5 72
Other 30 37 21 30 118
Table 2: Analysis of the quality problems of the camera shop using Pareto's law
Reasons for mistakes Camera 1 Camera 2 Camera 3 Total defective quantity
The size is wrong 2 5 3 10
Exposure 20 40 12 72
Development 30 40 25 95
Contrast 5 10 0 15
Film error 10 5 0 15
According to Pareto's law, we can avoid 80% of the waste by solving the 20% of the most important reasons.
Free. Table 1 shows the most common problems, and which device is the most prone to problems, the data in the table indicates that
What is the number of times the device has a problem. From this we can see that color cast is the most important issue.
The image registration ranks second, but after careful analysis, the image registration problem mainly appears on two printing presses (1And No. 4 machine), and so on. Through such analysis, you can roughly find out what the root cause of the problem is, and then seek solutions.